Look at the first of the HBO video. The marchers at the front of the “white nationalist” march just do not look like the typical white nationalists. I would really like to know who they are, and their ideology. Doubt are genuine.
If you were to give me $1000 and internet access, I’ll bet I could not find 20 white nationalists nationwide.
I can give you a link to the pdf file of the civil lawsuit against the participants in the Unite the Right Rally. There are about 30 defendants listed including individuals and groups that were there. And as a legal document that stands up in court, there are a lot of details as to the planning and implementation, and the roles they all played there in Charlottesville. It takes a while to read.
Once you have a few names, about 30 individuals and groups, then you can search with Google, Google images, or Youtube videos. Most people already know who Richard Spencer is, but don't know about who runs the Daily Stormer website. You probably have never heard of Vanguard America, or Identity Europa, or any of those groups, including the kkk groups that was there.
Or if you really want to get into it, set yourself up as undercover agent. Join one, or 2, of the groups , pay dues and show up for their meetings, and you might run into an undercover agent from the fbi or antifa.